Why Is the Cross-Sectional Method More Common Than the Longitudinal

Why is the cross-sectional method more common than the longitudinal method?

A) The results are obtained relatively quickly and it is less expensive.
B) The developmental change is observed directly among the same group of people.
C) The differences among groups of different ages reflect developmental age changes.
D) The results observed are based on comparisons among different cohorts of individuals.

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